Trigger circuit with switching hysteresis

Details Trigger circuit with switching hysteresis Trigger circuit with switching hysteresis

1990-09-11

1992-03-24

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307290, 307455, H03K 3289, H03K 329

Patent

active

050991426

ABSTRACT:
A trigger circuit with switching hysteresis includes first, second and third current sources. A first transistor pair is supplied by the first current source and has transistors with coupled emitters, load circuits and input circuits. The input circuit of one of the transistors of the first pair is acted upon by a reference potential and the input circuit of the other of the transistors of the first pair being acted upon by an input signal. Load resistors are each connected in the load circuit of a respective one of the transistors of the first pair. A coupling resistor interconnects the load circuits of the transistors of the first pair. A second transistor pair is supplied by the second current source and has transistors with coupled emitters, load circuits directly coupled with corresponding load circuits of the transistors of the first pair and input circuits cross-coupled with corresponding load circuits of the transistors of the first pair. A third transistor pair is supplied by the third current source and has transistors with coupled emitters, load circuits and input circuits being coupled with corresponding load circuits of the transistors of the first pair. Further load resistors are each connected in the load circuit of a respective one of the transistors of the third pair.

REFERENCES:
patent: 3728561 (1973-04-01), Brocker, Jr.
patent: 4485312 (1984-11-01), Kusakabe et al.
patent: 4551639 (1985-11-01), Takedo et al.
patent: 4560888 (1985-12-01), Oida
patent: 4601049 (1986-07-01), Wilhelm et al.
patent: 4628216 (1986-12-01), Mazumder
patent: 4777388 (1988-10-01), Widener
patent: 4810908 (1989-03-01), Suzuki et al.
patent: 4977335 (1990-12-01), Ogawa
patent: 5001361 (1991-03-01), Tamamura et al.

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